If you had to draw a covalent bond between two atoms, which items would you need to include?
a. the ions in each atom
b. electrons shared between atoms
c. the chemical symbols of the atoms
d. the protons in each atom

Asolution of naoh has a concentration of 25.00% by mass. what mass of naoh is present in 0.250 g of this solution? use the periodic table in the toolbar if needed. 0.0625 g what mass of naoh must be added to the solution to increase the concentration to 30.00% by mass? g